diff --git a/src/rlc.cpp b/src/rlc.cpp
index e5067c9d..c6d43304 100644
--- a/src/rlc.cpp
+++ b/src/rlc.cpp
@@ -91,7 +91,7 @@ int gprs_rlc_dl_window::mark_for_resend()
 /* Update the receive block bitmap */
 uint16_t gprs_rlc_ul_window::update_egprs_rbb(uint8_t *rbb)
 {
-	int i;
+	uint16_t i;
 	uint16_t bsn;
 	uint16_t bitmask = 0x80;
 	int8_t pos = 0;